Robustness of anaerobes exposed to cyanuric acid contaminated wastewater and achieving efficient removal via optimized co-digestion scheme

Journal of Advanced Research

Mona G. Ibrahim¹  Manabu Fujii²  Ahmed Tawfik³  Ahmed Elreedy³  Kabir Abdullahi⁴ 

[1] Corresponding author at: Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan.;Sanitary Engineering Department, Alexandria University, Alexandria 21544, Egypt;Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan;Environmental Engineering Department, Egypt-Japan University of Science and Technology, Alexandria 21934, Egypt;

关键词: Cyanuric acid;    Anaerobic treatment;    Industrial wastewater;    Co-digestion;    Microbial dynamics;   

DOI  :  

来源: DOAJ

【 摘 要 】

The impact of various industrial pollutants on anaerobes and the biodegradation potentials need much emphasis. This study aims to investigate the response of anaerobic microbial systems to cyanuric acid (CA) exposure; CA is toxic and possible carcinogen. First, the long-term exposure of mixed culture bacteria (i.e., municipal sludge) to low-strength wastewater containing 20 mg/L CA was conducted in an up-flow anaerobic staged reactor. Stable performance and sludge granulation were observed, and the microbial community structure showed the progression of genus Acinetobacter known as CA degrader. Second, batch-mode experiment was performed to examine the CA biodegradability at higher doses (up to 250 mg/L of CA) in the absence and presence of glucose as a co-substrate; response surface-based optimization was used to design this experiment and to estimate the optimum CA-glucose combination. CA removal of 77–98% was achieved when CA was co-digested with glucose (250–1,000 mg/L), after 7 days-incubation at temperature of 37 °C, compared to 34% when CA was solely digested. Further, the obtained methane yield dropped when CA exceeded over 125 mg/L, though the deterioration was mitigated by addition of higher concentration of glucose. Overall, we conclude that CA is efficiently degraded under anaerobic conditions when being co-digested with readily assimilable substrate.

【 授权许可】

Unknown